Furnace



, A. NILSON.

FURNACE Jan, 30,1923.

FILED,']UNE 17, 1920- Patented Jan. 3%, 1923.

tease;

ANDREW NILSON, OF CHICAGO, ILLINOIS, LASSIGNOR TO EUREKA SMOKELESS FURNACE 00., OF CHICAGO, ILLINOIS.

FURNACE.

Application filed June 17, 1920. Serial No..389,689.

T0 (ZZZ whom it may content:

Be it known that 1, ANDREW NLLSON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Furnaces, of which the following is full, clear, concise. and exact description, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to furnaces, and more particularly to a furnace provided with a battle wall in the fire box to providea combustion chamber to the rear thereof.

This invention has for its purpose to provide means for the shaking of the grate sections rearwardly of the battle wall separate from the means for shaking the grate forwardly thereof.

This invention also has for its purpose the provision of means to prevent cold air 'froin the ash pit from following a path along the water leg and lower tubes of the boiler, without mixing with the hot gases in the coinbustion chamber, the rear grate section b ing provided with perforations only over.

half its area for this purpose.

Other objects and advantages of the in vention will become apparent as the description of the accompanying drawings proceeds, in which Fig. 1 is a longitudinal vertical sectional view of the improved furnace. showing the fire box portion thereof, the boiler being partly broken away;

Fig. 2 is a fragmentary sectional view on line 2-? Fig. 1, showing the rear portion. of the grate and associated parts.

eferring now more in detail to the accompanying drawings the improved furnace comprises a fire box 3 having a roof 4: and a rear wall 5, the lower portion of which comprises the water leg 6. In the fire box 3 is provided a baffle wall 7 that rests on a member 8 through'which water can circulate. The baflle wall 7 is provided with a channel 9 o ening toward the front of the furnace in t e upper portion thereof and extending downwardly and rearwardly into the combustion chamber 10 that is provided rearwardly of the baffle wall 7. Separating the fire box 3 and the ash pit 11 is the grate 12 which'coinprises a pltiralit of pivotally mounted grate sections 1.5 an 14%.:

The grate sections 13 are secured together by the bar 15 to which they are pivotally connected and which has pivotally connected thereto the shaker bar 16, which is provided with a suitable socket member '17 for receiving an operating handle, the socket 17 being suitably pivoted to cars on the furnace front 18'. The grate sections 1 1 are pivoted to the connecting bar 19 that has pivoted thereto the shakerbar 20, which is suitably pivotedto the socket member 21 pivoted between the ears 22 on the furnace front 18. The grate sections 1st are below that portion of the fire boxrearwardly of the baffle wall '7, or in other words, these grate sections 1' 1 separate the combustion chamber, from the ash pit. The grate section '14, adjacent the grate sections 13, is a duplicate of these grate sections 13 and comprises a central web 23 and laterally projecting teeth 2&1 providing openings 25 therebetween. The grate sect-ion '14, adjacent the rear wall of the fire box, is provided on one side-thereof with the teeth 24, while the other side 26 thereof is made in one solid piece extending substantially over to the shelf 27 providedat the rear'of the fire box, only enough space being left to permit of the shaking of this grate section. v I 3 Ordinarily if the grate sections Mat the rear of the fire box were'made as are the remaining grate sections, a stream of cold'air from the ash pit would flow through the perforations in the rear half of this grate section and would follow the water leg 6 along the wall thereof as indicated by the arrows in Fig. 1, and then along the lowermost fiues without mingling with the heated gases in the combustion chamber 10, thus cooling the water leg 6 and adjacent portions of the boiler and resulting in the loss of the oxygen in the air, thus passing along the water leg, for carrying out the processes of combustion in the chamber 10. By providing.

the rear grate sections 14 with an imperforate portion in the rear thereof, the cold air from the ash pit is forced through the perforations between the teeth on the remaining grate sections, and as it is then passing through the grate at a considerable distance from the water leg 6 this air will mingle with the hot gases in the combustion chamber 10 and will become thoroughly heated and sirloin-ed thert-iwith and will. aidin the combustion of the gases contained there in and instead or" cooling the boiler will aid in heating it.

It will be noted that the grate sections 1 are entirely independent of the grate sections 13, the grate sections 13 all being connected together and operated by a single handle to shake the same, and the grate sections 14 being connected together and being operated by a diiterent handle. In the use of a furnace with a baiiie wall, such as that shown, the coal is piled up against the battle wall and is permitted to fall rearwardly of the bafile wall in such position as it would assume due to its own weight. When the coal is in this position it is often necessary and desirable to clean the rear portions of the grate without disturbing the coal in the forward portion of the tire box, and in order to do this the rear grate sections must be arranged so as to be operated independently of the forward grate sections. This is accompl'shed by mounting the two rear grate sections it so as to be shakened independently of the grate sections 13. It will be seen from the above that a means has been provided for deflecting the cold air entering from the ash pit away from the water leg and thus causing the same to be properly mixed with the heated gases in the combustion chamber, and that there has also been provided a means for properly cleaning the grates rearwardly of the battle wall by providing a separate means for shaking the same. 7

Having thus described my invention I desire to have it understood that I do not intend to limit myself to the exact details shown and described except as defined in the following claims 1. In a furnace a grate comprising a plurality of pivoted grate sections, said grate having openings therein formed between a water leg at the rear wall thereof, an ash.

pit and a grate extending over the entire area of said fire box and separating said tire box and ash pit, and PTOVl ilGtl with open-- ings therein to admit air from said ash pit, said grate being impertorate :Ifl]l(.h said water leg.

4. In a furnace an ash pit, a tire hex, a grate separat ng said tire box and said ash pit and having openings for permitting air to enter said fire box from said ash pit. a water leg at the rear oi? said ash pit, and a battle wall )roviding a combustion chamber rearwardly thereof, said grate being provided with means to deflect the a r :trom said ash pit away from said water leg and to ward the center of said combustion chamber.

5. In a furnace an ash pit, a fire box, a grate separating said ire box and said ash pit and having openings for permitting air to enter said fire box from said ash pit, a water leg at the rear of said ash pit, and a battle wall providing a. combustion chamber rearwardly thereof, said grate being provided with means to deflect the air from said ash pit away from said water leg and toward the center of said combustion chamber, and. means to shake the portion thereot rearwardly of sa d baiiie wall independently of the portion forwardly of said wall.

In witness whereof, I hereunto subscribe my name this 14th day oi June, A. D., 192

ANUREVV NILSON. 

